I am in zone 6 which means we get hard frosts... but not solid snow for months on end. In early winter the last of the foliage is down so the goats go out on the winery fields. They will spend the winter out there but be moved before the vines start new shoots in spring.. the goats love those and that is a problem!
A month makes all the difference here. We go from lovely fall colors in Nov to winter... but we get early grass which means winter lambs and forage for certain animals. Every climate is different so figure out what works for you and your area. I don't keep goats myself.. this is a beautiful winery on the road to my farm.